Overstitch mechanism



l. P. WEIS. ovmmcnv M'EcHANlsM. APPLICATION YFiLED JAN. 2. 1919.

Patented June 6, 1922,l

JOHN PETER WEIS, 0F NYACK, NEW YORK, OR OF ONEJ-IALF '110 METROPOLI- TAN SEWING MACHNE CORFRTION, OF DVER, DELAYVAll/E, A. CORPBATION OF DELAWARE.

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Specicaton of Letters Patent.

Patented il une 6, 1922.

Original application led Vtctober 16, 1914, Serial No. 867,905. Patent No. l,38,526, dated August 3, 1920. Divided and this application led January 2, 1919. Serial ld-269,279.

'T 0 aZZ'w 710m 1li/may concern Be it known that l, JOHN PETER llnis, a citizen of the United States, residing at Nyack, in the county of Rockland and State of New York, have invented certain new and useful Improvements in Overstitch Mechanism, of which the following is a specification.

This invention relates to over-stitch mechanism and this application is a division of my application Serial No. 867 ,005. led October 16, 1914, patented Augusty 8, 1920, Patent No. 1,848,526. rEhe object of the invention is to separate the cut edges of goods and simultaneously to over-stitch one of such cut edges."

ln the accompanying drawings forming a part hereof,

Fig. 1 is a detail elevation of a two-thread over-stitch mechanism looking in the direction of the arrow shown in Fig. 2. The view is partially in section through the throat plate and through cut goods the cut edges of which are separated.

Fig. 2 is a top plan View of what is shown kin Fig. 1 and illustrates the making ofthe over-stitch on the goods. f

Fig. 3 is a front end elevation of a sewingmachine head equipped with the present over-stitch mechanism and its actuating means.

n j Fig. 4 is a side elevation of what is shown in Fig. 8, the head being sectioned at line 4--4 of Fig. 3.

Figs. 5, 6, 7 and 8 are diagrammatic views showing different steps in the formation oi the over-stitching.

That form of the invention shownin the drawings is particularly useful in automatic cutting-and-sewing machines of the type described in my Letters Patent No. 1,114,082

of October 20, 1914, and in my said pending application. It is not limited to such machines. l

In the drawingsnl show side-weighted Lor counter-balanced crank-and-pitman needleactuating means such as shown in my aforesaid pending application and also in my `api plication. Serial No. 269,273 filed January 2,

1919, the latter being a division of my said pending application Serial No. 867,005, filed October 16, 1914. ln the embodiment of the invention shown,`the over-stitch mechanism is actuated from said side-weighted-pitman scribed.

The over-stitch mechanism comprises a link 5 pivotally connected to the crank pin of the crank at one end, and at its other end pivoted at 6 with one arm ota bell crank lever 7 the other arm of which is pivoted at 8 to a bracket 9 on the sewing-machine head. Between its ends the bell crank 8 is pivotally connected at 10 to a downwardly-extending link 11, the lower end of which is pivoted on stud 12 to the lower end oit' a lateral link 13 the upper end of which is pivoted at 14 to a bracket 15 which is a lower and divergentlyextending portiono'the bracket 9. The upper end 16 of the looper arm 17 is j ournaled on the pivot stud 12, being interposed between the lower end of the link 11 and the lower end of the link 13. This looper arm is pivoted at 18 between its ends to a link 19 which is pivoted at 20 to the bracket 15, but ata point below and nearer the needle than the pivot 14. The looper stem or portion below the pivot 18 is indicated by 21 and its lower end 22 is formed as a linger the purpose of which is to project into a space as formed by cutting goods,`and to remain between the walls of such cut to keep the cut edge being stitched from getting into the path ot the laterally-projecting looper jaws 28 and 24 which are rigid lateral projections of the looper stem projecting therefrom. into the path of the needle. This is illustrated in Fig. 2 where the slit in the goods is formed by some goods cutter, not illustrated and not necessary to show. The bracket 9 carries a needle holder guide 25 whereby, as

described in my said other applications, the

needle is reciprocated in a vertical path vthrough the throat plate P. 'The jawed neath the throat-plate tongue 29 drawing said loop out as shown in Fig. 6 so as to cast the same around the lower looper jaw 24 as shown in Fig. 7. rEhe upper looper jaw is a primary needle-loop receiving jaw and the under aw 2a is the thread-carrying aw, but in casting the loop on the lower jaw the thread comes 'from the upper jaw, all oit which will be readily understood by those skilled in the art, as the arrangement oit the looper jaws and the needle here shown are of themselves old and well known; but in the present case I have turned the old looper mechanism in question upside-down and reversed and relation of the jaws one to the other and provided the looper stem with a separator finger 22. However I am the tirst so far as I know to locate this old overstitching mechanism above the throat plate `projecting bracket 15. The result is that the looper jaws extend towards the needle diagonally to the line oit cutting by the cutter C and to the line ot' stitching formed by the machine in which this looper mechanism is embodied. The diagonal relation is indicated in Fig. 2. The purpose of this arrangement is at all times to keep the looper as close to the edge oit the slot in the goods that is being stitched `as feasible; to cause the looper jaws to inoveinto a position behind the needle when below the throat plate; to move into a position in front of the needle when above the throat plate properly to form the stitch; to secure a minimum projection of the looper jaws at one side ot the path of the cutting run of the cutter C as is feasible in order that the opposite edges of the slot as may be separated a minimum distance. The V -shaped character of the cut shown in Fig. 2 is due in part ,to the` springing apa-rt of the cut edges as they are formed, 'and in part to the lateral vibration of the separator linger between their edges, the finger tending to push them slightly one way or the other, or by the independent action of the goods or ot the separator finger according to the character of the goods acted upon. Tubular knit goods when slit after being distended on a spreader used in feeding ,the goods. spring apart at the cut edges to a considerable extent. Flat goods on the other hand would have the {cutedges separated Inore particularly by the vibration of the separator finger. The separator used in feeding knit goods is the device shown in my said prior patent and in my goods-spreader Patent No. 1,139,612 of May 1S, 1915, and used in machines ot the type of my Patent No. 1,114,082. As the looper rises, the needle thread loop slides back on the jaw 211 to the position shown in Fig. 7, at which time the looper thread 30y carried by the looper jaw 24 lies at an angle extending from the throat-plate tongue 29 to the front eye of the looper jaw 24 forming a ,triangle so that the point oit the needle may enter between the looper jaw and the thread and draw the looperthread down on the upper surface of the work as indicated by 31 in Fig. 8'. As the looper moves outward and downward the needle thread 32 drops from the end of the looper jaw 24 so as to form the stitches 33 (Fig. 2).

W'hile the looper thread 30 forms the beaded edge 34 of the seam, the movements of the looper are such that the separator linger always remains within the slot The looper mechanism is so timed in relation to the reciprocationof the needle `that the looper is slightly slower in its movements than the needle is in its movements, and this difference in speed of timing permits the needle to deflect the needle thread loop as shown in Fig. 5 for the entrance of the looper jaw 23 into theneedle loop. Consequently the needle is rising ahead of the looper and starts to descend in time to enter the looper thread loop Aas the `looper jaw 24 reaches the position shown in Fig. 7 the needle enters the loop of looper thread to complete the formation of the stitch (Fig. 8). rfhe throat plate 35 has a slotted needlehole 86 and the work-holding foot 37 which is only partially shown herein is ful-ly illustrated in my said application, Serial No. 269,273, liled January 2, 1919, and is provided with a projecting tongue 38 over which the stitches are formed, the ,slotted needle-hole and work-foot tongue strncture being known in over-stitch mechanism.

What I claim is,- 1. The combination, in a sewing machine, of a needle actuating mechanism operatively connected with a `revoluble shaft located above the throat plate; said shaft; and said throat plate provided with a hole for the needle and for a looper; a looper located above the throat plate; and a looper actuating mechanism located above the throat plate and operatively connected with said shaft forv actuation of the needle actuating meehanism, whereby the shaft `operates both the needle andthe looper from above the throat plate; the looper having near its lower end a pair of looper jaws and also having below the under jaw, at the free end ofthe looper, a dependent goods separating linger 5 yand the 1099er actuating mechanism comprising means to reciprocate it from above to belowv the goods and from below and other means for vibrating the body of the looper above the throat plate from and towards the needle path; a work holding foot having a projecting tongue over which the stitches are formed; and a goods cutting means operative adjacent the needle path.

2. The combination, in a sewing machine, of a needle and needle actuating mechanism; a two-jawed looper and looper actuating mechanism and a goods cutter and mechanism for operating it adjacent the needle path for cutting the goods preparatory to the stitching of a cut edge, the jawed looper being provided with a goods separator linger at its free end for entrance between the cut edges of the goods and separating the cut edges apart; and a work holding foot having a projecting tongue over which the stitches are formed.

3. The combination, in a sewing machine, of a needle; a needle reciprocatingk mechanism comprising a drive shaft; a two-j awed looper having a goods separator finger at its free end and mechanism for operatively conto above the goods necting said looper with said drive shaft; a throat plate provided with a hole for the needle and for the jawed portion of the looper; a -oods cutting mechanism operative adjacent tre path of the needle and of the jawed portion of the looper; and a work holding foot having a projecting tongue over which the stitches are formed.

4. The combination, in a sewing machine, of a needle and needle actuating mechanism comprising a drive shaft; a two-jawed looper; a looper actuating mechanism operatively connected with the drive shaft; a goods cutter and cutter actuating mechanism for operating the cutter to cut the goods preparatory to the stitching of a cut edge adjacent the paths of the needle and looper, the looper being provided at its free end with a goods separator finger entrant between the cut edges and operative to space the cut edges apart; and a device cooperating with the two-jawed looper for formation of stitchesr In testimony whereof I have hereunto set my hand this 27 th day of December, 1918.

JOHN PETER WEIS. 

